Bump influxdb-java from 2.14 to 2.15 in /modules/influxdb

[dependabot-preview]

Bumps influxdb-java from 2.14 to 2.15.

Changelog

Sourced from influxdb-java's changelog.

2.15 [unreleased]

Fixes

• Close underlying OkHttpClient when closing [Issue #359](https://github-redirect.dependabot.com/influxdata/influxdb-java/issues/359)
• Update OkHttp to 3.13.1 which disables TLSv1 and TLSv1.1 by default, if still required you can enable them:

OkHttpClient client = new OkHttpClient.Builder()
    .connectionSpecs(Arrays.asList(ConnectionSpec.COMPATIBLE_TLS))
    .build();

Features

• Query and BatchPoints do not mandate a database name, in which case the InfluxDB database
  would be used [Issue #548](https://github-redirect.dependabot.com/influxdata/influxdb-java/issues/548)
• Add BatchPoints.Builder.points(Collection)
  [Issue #451](https://github-redirect.dependabot.com/influxdata/influxdb-java/issues/451)
• @​Column supports class inheritance
  [Issue #367](https://github-redirect.dependabot.com/influxdata/influxdb-java/issues/367)
• BatchOptions to have .precision()
  [Issue #532](https://github-redirect.dependabot.com/influxdata/influxdb-java/issues/532)

Commits

• bfbbcd0 [maven-release-plugin] prepare release influxdb-java-2.15
• c8bac67 Fix error parsing timestamp containing offset (#575)
• 1dafcc1 Features/add fields by pojo (#519)
• d9c9e49 make javadoc build again
• 032c3c4 Update okhttp from 3.12 -> 3.13.1 which disable TLSv1 and TLSv1.1, take junit...
• 90395a8 Merge pull request #572 from asashour/precision
• 06131dc Merge pull request #571 from asashour/close
• 5c60de0 checkstyle
• 97df07f Fix test
• 3caa96d BatchOptions to have .precision()
• Additional commits viewable in compare view

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